Remove a screw retaining the keyboard.

Lift the keyboard from the back to disengage it from clips on the two sides. Take care not to lift it too far or you may damage its connecting ribbon.

Turn the keyboard over by lifting the back and turning it towards yourself. Lay it flat on its face.

With a fingernail or prying tool, gently lift the black clamping bar on the keyboard ribbon connector and withdraw the ribbon from the connector.

Note that the black clamping bar is easily broken. Repair would be very difficult.